hello mrzero...
so I do that! but no work...
1. first all aruba IAP connecto to the switch...then dhcp asiggned IP address to them
2. delete Instant SSID, then created another..so all the IAP are connected to the new SSID
3. disconnect IAPs excep the master from the switch, then turn on the other IAPs
but not connect, so I need to do something more?